KB'S TOOL OF THE WEEK

KB'S TOOLS AND REPAIR

Store Hours:
Mon-Fri: 9am-5pm
Phone Number:
(905)-685-6000

E-Mail:
kbtools@bellnet.ca

GENERAL JOINTER PART-III

With the two tables adjusted to the same height, the indicator and indicator rod is extended and reset to zero. The surface gauge is moved towards the out-feed, and when the indicator touches,the reading remained zero. There was a -.0015 drop over a 10″ length, when the surface gauge was moved to the end of the in-feed table. This change shows a very slight difference in the angles of the in-feed and out-feed tables.

INDICATOR AND ROD REPOSITIONED

CHECKING FOR A CHANGE IN HEIGHT

I wanted to verify my readings which is comparing the in-feed table to the out-feed. The straight edge was set up on two blocks resting on the out-feed table, while the surface gauge was set up on the in-feed table and moved front to back. If the first readings showed the tables where out to one another at a value of .0015 over 10″, and knowing the in-feed table had a length of 18″, the amount of variation should be approximately .003 over the 18″. Using the setup shown in the following picture, the table over it length(less the size of the surface gauge) was out .002″ over a length of 15″. This verifies the first set of readings.

CHECKING THE IN-FEED TABLE

 

GENERAL JOINTER PART-IV

The last check of the tables will be a left to right measurement. The surface gauge was setup on the in-feed table, with the indicator tip riding on the out-feed table. The surface gauge is then move side to side. There was a change in the indicator of .0011 over a length of 6″.

CHECKING LEFT TO RIGHT

CHECKING LEFT TO RIGHT

 

  WHERE IS IT OUT ?

The angles of the base and two tables are out. The question is where? The method I would use to pinpoint the error includes the Starret precision level (.0005/12″). The base would have to be removed from the cabinet, and set up on a surface plate that is leveled. The level can now be placed on the top of both table surfaces and the readings recorded. This would show if one or both tables are out over the length as well as left to right. At this point I will not proceed to this step for a number of reasons. There is a very small amount of deviation in the tables and knowing which angle is out dosn’t mean much without correcting the problem.

 THE FENCE

The 36″ fence was checked for flatness by setting it on 1-2-3 blocks atop the surface plate. The surface gauge and indicator was set up and I scanned as much of the ground face as possible. This includes checking end to end, and in and out. The indicator was zeroed at the large end and slid towards the smaller end, producing a .003 taper. The in and out show a consistent change of .0015 at various intervals along the length of the fence.

CHECKING THE FENCE FOR FLATNESS

A .003 INCREASE TO THE INDICATOR

 
 

 

 

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